Plant growth regulatorsare those artificial materials which have comparable physical and biological impacts with plant hormonal agents, primarily including auxin, gibberellin, cytokinin, abscisic acid, vinyl and brassinolide, etc.Plant
. growth regulator in the growth and advancement of watermelon are used in the
. following elements: the
nursery stage utilizing gibberellic acid (gibberelin class)
. as an initiator to enhance the germination rate and germination energy( germinating
. uniformity) of watermelon seed; while the temperature or humidity is not the
. time using development inhibitors to prevent” tall seedlings “happening, prevent
. leggy seedlings; if the seeds with good quality and environmental conditions
. are appropriate so that it can completely no requirement the growth regulators. After watermelon
. transplanting to the field the plant development regulator which promote watermelon
. fruit is the most widely used, generally the cytokinin substances;
currently the
. most commonly utilized in the production is Forchlorfenuron, it belongs to a
. artificial cytokinin substance, the chemical name is 1- (2 -chloro-4- pyridyl
)
. -3 -phenyl urea, also called forchlorfenuron, CPPU, KT-30 and so on.
Watermelon
. is a kind of typical cross-pollinated crop, before fructify it must be
.
pollinated. In the early spring cultivation, some areas are due to the fact that of more
.
rainy days, low temperature, insufficient light, watermelon plants male flowers
.
open less, pollen viability is low, artificial pollination exist pollination
. challenging, not fructify and other exceptional issues, so that utilize the development
. regulator including CPPU and other substances to deal with, have the advantages of
. low cost, high fructify, and therefore have some extent applying on watermelon
.
production.CPPU
. can successfully promote watermelon fructify, there have been many documents
.
reported the
application of CPPU on watermelon’s growth and advancement. CPPU
. is commonly accepted that can induce the parthenocarpic of watermelon, improve watermelon’s
.
fruition rate and promote watermelon fruit increasing the size of, therefore, CPPU likewise
.
typically referred fructify drug.Currently,
. all nations in the world were performed the pesticide registration system,
.
just the registered pesticides enabled appearing in the market and use.
In the
. pesticide registration process, the government department extensive evaluation the
. environmental security of pharmacon, get signed up representatives are proven safe for
. the environment and human health. The United States in September 2004
.
authorized forchlorfenuron( the brand name CPPU, KT-30) as a brand-new plant development regulator utilized
. on the grapes and kiwi. The United
. States think CPPU is a cytokinin, can
. promote fruit expanding, enhance fruition rate, boost production, extended the
. storage time of grapes and kiwi, not impacting the variety of fruit and maintain
. fruit quality.In Japan, CPPU is a
. chemical extensively utilized in agriculture, to boost the yield
and quality of kiwi,
.
grapes, pears and others, likewise utilized to enhance the fruition rate of watermelon,
. melon and pumpkin.Japanese
. prescribed optimum residue limits (MRL )for pesticides
CPPU value is 0.1 mg/kg
,
.
Australia, Israel, USA, New Zealand and other nations required the MRL of
.
CPPU is 0.01 mg/kg, the European Union, Switzerland, South Korea and so on
.
required the pesticide residue standards of CPPU is 0.05 mg/kg.
China required
. the MRL of watermelon CPPU is 0.1 mg/kg.
About the
. residue analysis of CPPU used in watermelon, researchers performed a
. organized study, the results reveal that Forchlorfenuron dissipated in
. watermelon is reasonably quickly, the half-life is 1.2-1
.67 d; when the watermelon
. harvest (after using the drug 40d), there is not Forchlorfenuron
residue spotted
. in watermelon fruit; soil likewise not discovered out Forchlorfenuron residues,
. results strongly show that use in the suggested dosage< img src=" http://www.articlesfactory.com/pic/x.gif" alt =" Short article Submission" border=" 0"/ >, CPPU use in
. watermelon is safe.Source: http://www.cospcn.com Plant Based Diet